1. Intellectual Disability: Definition, Classification, and Systems of Supports;Schalock RL,2010
2. Diagnostic and Statistical Manual of Mental Disorders,2013
3. World report on disability,2011
4. Demographic Censuses
5. Legislative Decree nº 186, of July 09, 2008: Decree nº 6.949, of August 25, 2009. Convention on the Rights of Persons with Disabilities. Optional Protocol to the Convention on the Rights of Persons with Disabilities,2010